Failed to Create Index on Plain Text Document!

SPS is succesfully creating index on all file types mentionedin "Additional Settings"Inside Workspace/Management/Content Sources.Here .txt is mentioned, so Files with .txt extension are indexedproperly by SPS.But I have a document which is "Plain Text" Type.When I publish this document and run an index, SPS doesnt index thisand thus doesnt show in search.

Please let me know as why it is not indexing "Plain Text".Do I need to add any particular File Extension in File Typesin "Additional Settings".

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